HB25 hf-sound noise problems

Gert-Ove

Hi,

I am using some HB25 DC motorcontrolers for a artistic motion installation. They create some HF noise when running DC motors (Load 1A) . The noise is approx 10KHz, hardly noticeable for older people like me (53 years) but annoying for younger people. The trouble is because the installation should be as silent as possible.
Does somebody had the same experience? Any solution?

thanks
Gert-Ove

Chris Savage

Gert-Ove,

The noise is coming from the motors themselves, and is due to the way the HB-25 controls the speed of the motor. In fact, you would normally only notice the sound at lower speeds. The PWM frequency is just below 10 kHz so that’s what you are hearing. The only solutions I can think of is some sort of filter at the PWM frequency or to use a motor controller that uses a different frequency.

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Chris Savage
Parallax Tech Support

Franklin

Chris, if you were to add some filtering like you would have on a power supply could you mitigate the noise?

<edit> Geez, I need to learn to read past the first punctionation mark...

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- Stephen

Post Edited (Franklin) : 8/8/2008 2:24:38 AM GMT

Chris Savage

Please see my reply above. [noparse];)[/noparse]

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Chris Savage
Parallax Tech Support